2021-06-23

New gravitational wave detector: can be used to find a black hole the size of a tennis ball

By yqqlm yqqlm

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New gravitational wave detector: can be used to find a black hole the size of a tennis ball

It is understood that the research team led by him has just developed an application of this type of detector to observe “small” primitive black holes. Their research results have been published in “Physical Review D” a few days ago. “Until today, these primordial black holes are still hypothetical, because it is difficult to distinguish between the black holes produced by the implosion of the stellar core and the primordial black holes. If it is possible to observe a smaller black hole, that is, a black hole with a mass of a planet but only a few centimeters in size, the situation is It will be different,” the research team said. They continued: “We are providing experimenters with a device that can detect them by capturing the gravitational waves emitted when they merge. The frequency of this gravitational wave is much higher than currently available.”

< p>But what is the technique? A gravitational wave “antenna” is composed of a specific metal cavity and is properly immersed in a strong external magnetic field. When gravitational waves pass through a magnetic field, electromagnetic waves are generated in the cavity. To a certain extent, gravitational waves make the cavity “hiss” (resonance), not with sound but with microwaves.

This device is only a few meters in size, but it is enough to detect the fusion of primitive small black holes millions of light-years away from Earth. It is much more compact than common detectors several kilometers long like LIGO, Virgo and KAGRA interferometers. This detection method makes it very sensitive to very high frequency gravitational waves (of the order of 100 MHz, while LIGO / Virgo / Kagra gravitational waves are only 10-1000 Hz), and these gravitational waves are not caused by fusion, neutron stars or stellar black holes. And other ordinary astrophysical sources.

On the other hand, it is an ideal tool for detecting small black holes. The mass and size of the planet has changed from a small ball to a tennis ball. “Our detector solution combines what we have mastered and the technologies we have in everyday life, such as the magnetron in the microwave oven, nuclear magnetic resonance magnets, and radio antennas. But don’t take your home appliances apart and start taking risks: read us first. Article, and then order your equipment, figure out the equipment and the output signal,” the researcher said with a smile.

Although this patented technology is still in the advanced theoretical modeling stage, it has all the necessary elements to enter a more specific stage, namely the construction of a prototype. In any case, it paved the way for basic research on the origin of our universe. In addition to primitive black holes, this type of detector can also directly observe the gravitational waves emitted during the Big Bang to detect physics with higher energy than that achieved in particle accelerators.